Device for preparing ammonium sulfate from high-concentration ammonia-containing wastewater

Abstract

This utility model relates to an apparatus for recovering high-concentration ammonia-containing wastewater to prepare ammonium sulfate, comprising an ammonia-containing wastewater storage tank and a NaOH storage tank. The output pipelines of the ammonia-containing wastewater storage tank and the NaOH storage tank are connected to the upper part of an ammonia stripping tower via a pipeline mixer and a preheater. A steam input pipe is installed at the lower part of the ammonia stripping tower. A light component output pipe at the top of the ammonia stripping tower is connected to the ammonium sulfate storage tank via a cooler. An industrial water inlet pipe and a concentrated sulfuric acid inlet pipe are installed at the top of the ammonium sulfate storage tank. A circulation pipe is installed at the bottom of the ammonium sulfate storage tank, connected to the light component output pipe via an ammonium sulfate discharge pump. A discharge branch pipe connected to an ammonium sulfate packaging system is installed on the circulation pipe. This apparatus not only obtains ammonium sulfate as a byproduct but also reduces losses and lowers processing costs.

Description

Technical Field

[0001] This utility model relates to an apparatus for preparing ammonium sulfate by recovering high-concentration ammonia-containing wastewater. Background Technology

[0002] Ammonia-containing wastewater is a type of industrial wastewater, primarily originating from the production processes of many industries. For example, the chemical, pharmaceutical, food, and textile industries all generate ammonia-containing wastewater. The ammonia nitrogen concentration in this wastewater can reach thousands of milligrams per liter, exhibiting strong corrosiveness and toxicity.

[0003] The discharge of ammonia-containing wastewater poses significant risks to the environment and human health. On the one hand, the ammonia nitrogen in the wastewater reduces the oxygen content in water bodies, leading to eutrophication and the formation of dead zones, which severely impacts the survival and growth of aquatic organisms. On the other hand, ammonia-containing wastewater is highly volatile, causing air pollution and also harming farmland and vegetation to varying degrees.

[0004] To reduce the environmental harm caused by ammonia-containing wastewater, effective treatment is necessary. Currently, commonly used methods for treating ammonia-containing wastewater include biological treatment, physiochemical treatment, and immobilized microbial treatment. While physiochemical treatment can provide a more comprehensive solution, current equipment used for this purpose suffers from high operating losses and incurres high treatment costs. Utility Model Content

[0005] The purpose of this invention is to provide a device for recovering high-concentration ammonia-containing wastewater to prepare ammonium sulfate. This device can not only obtain ammonium sulfate byproducts, but also reduce energy consumption and processing costs.

[0006] The technical solution of this utility model is as follows: an apparatus for recovering high-concentration ammonia-containing wastewater to prepare ammonium sulfate, comprising an ammonia-containing wastewater storage tank and a NaOH storage tank, wherein the output pipelines of the ammonia-containing wastewater storage tank and the NaOH storage tank are connected to the upper part of an ammonia stripping tower via a pipeline mixer and a preheater, a steam input pipe is provided at the lower part of the ammonia stripping tower, and a light component output pipe at the top of the ammonia stripping tower is connected to the ammonium sulfate storage tank via a cooler, an industrial water inlet pipe and a concentrated sulfuric acid inlet pipe are provided at the top of the ammonium sulfate storage tank, and a circulation pipe is provided at the bottom of the ammonium sulfate storage tank via an ammonium sulfate discharge pump and connected to the light component output pipe, and a discharge branch pipe connected to the ammonium sulfate packaging system is provided on the circulation pipe.

[0007] Furthermore, the output pipeline of the ammonia-containing wastewater storage tank is connected to one end of the pipeline mixer, and an ammonia-containing wastewater discharge pump is installed on the output pipeline of the ammonia-containing wastewater storage tank.

[0008] Furthermore, the output pipeline of the NaOH storage tank is connected to one end of the side wall of the pipeline mixer, and a metering pump is installed on the output pipeline of the NaOH storage tank.

[0009] Furthermore, the other end of the pipeline mixer is connected to the cold medium inlet of the preheater, and the cold medium outlet of the preheater is provided with an alkaline ammonia-containing wastewater output pipe that penetrates into the upper part of the ammonia stripping tower. The alkaline ammonia-containing wastewater output pipe is provided with a downward spray structure inside the ammonia stripping tower.

[0010] Furthermore, the steam input pipe extends into the lower part of the ammonia stripping tower, and an upward-facing spray structure is installed inside the ammonia stripping tower.

[0011] Furthermore, the bottom of the ammonia stripping tower is provided with a low-concentration ammonia-containing wastewater inlet pipe connected to the heat medium inlet of the preheater via a tower bottom discharge pump. The low-concentration ammonia-containing wastewater inlet pipe is provided with a reflux branch pipe that penetrates into the lower part of the ammonia stripping tower and is equipped with a spray structure.

[0012] Furthermore, the outlet of the preheater is connected to a low-concentration ammonia-containing wastewater outlet pipe connected to the wastewater system.

[0013] Furthermore, a low-temperature chilled water inlet pipe is connected to the lower side wall of the cooler, and a low-temperature chilled water outlet pipe is connected to the upper side wall of the cooler.

[0014] Compared with the prior art, the present invention has the following advantages: 1. This device helps to recycle high-concentration ammonia-containing wastewater and produce ammonium sulfate by-products, thereby improving economic efficiency.

[0015] 2. This device increases the ammonia evaporation rate by adding alkali, and reduces energy loss by using direct steam heating; it also helps to significantly reduce the amount of low-concentration ammonia-containing wastewater that needs to be treated, thus reducing the cost of ammonia-containing wastewater treatment.

[0016] 3. This device increases the ammonium sulfate content and reduces raw material costs by absorbing concentrated sulfuric acid. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of this utility model; In the diagram: 1-NaOH storage tank 101-Output pipeline of NaOH storage tank 2-Metering pump 3-Ammonia-containing wastewater storage tank 301-Output pipeline of ammonia-containing wastewater storage tank 4-Ammonia-containing wastewater discharge pump 5-Pipeline mixer 6-Preheater 61-Alkaline ammonia-containing wastewater output pipe 62-Low-concentration ammonia-containing wastewater output pipe 7-Ammonia stripping tower 71-Light component output pipe 72-Low-concentration ammonia-containing wastewater inlet pipe 73-Recirculation branch pipe 8-Tower bottom discharge pump 9-Cooler 91-Low-temperature chilled water inlet pipe 92-Low-temperature chilled water outlet pipe 10-Ammonium sulfate storage tank 11-Steam input pipe 12-Industrial water inlet pipe 13-Concentrated sulfuric acid inlet pipe 14-Ammonium sulfate discharge pump 15-Circulation pipe 16-Discharge branch pipe. Detailed Implementation

[0018] To make the above-mentioned features and advantages of this utility model more easily understood, specific embodiments are described below in conjunction with the accompanying drawings, but this utility model is not limited thereto.

[0019] refer to Figure 1 An apparatus for preparing ammonium sulfate from high-concentration ammonia-containing wastewater includes an ammonia-containing wastewater storage tank 3 and a NaOH storage tank 1. The output pipelines of the ammonia-containing wastewater storage tank and the NaOH storage tank are connected to the upper part of an ammonia stripping tower 7 via a pipeline mixer 5 and a preheater 6. A steam input pipe 11 is installed at the lower part of the ammonia stripping tower. A light component output pipe 71 at the top of the ammonia stripping tower is connected to an ammonium sulfate storage tank 10 via a cooler 9. An industrial water inlet pipe 12 and a concentrated sulfuric acid inlet pipe 13 are installed at the top of the ammonium sulfate storage tank. A circulation pipe 15, connected to the light component output pipe via an ammonium sulfate discharge pump 14, is installed at the bottom of the ammonium sulfate storage tank. A discharge branch pipe 16 is installed on the circulation pipe, connecting to an ammonium sulfate packaging system to pump ammonium sulfate of the appropriate concentration to the packaging system for packaging.

[0020] In this embodiment, the output pipeline 301 of the ammonia-containing wastewater storage tank is connected to one end of the pipeline mixer. An ammonia-containing wastewater discharge pump 4 is installed on the output pipeline of the ammonia-containing wastewater storage tank so that high-concentration ammonia-containing wastewater can be pumped into the pipeline mixer to mix with NaOH.

[0021] In this embodiment, the output pipeline 101 of the NaOH storage tank is connected to one end of the side wall of the pipeline mixer. A metering pump 2 is installed on the output pipeline of the NaOH storage tank so that the NaOH solution is pumped into the pipeline mixer to mix with the high-concentration ammonia-containing wastewater.

[0022] In this embodiment, the other end of the pipeline mixer is connected to the cold medium inlet of the preheater, and the cold medium outlet of the preheater is provided with an alkaline ammonia-containing wastewater output pipe 61 that penetrates into the upper part of the ammonia stripping tower. The alkaline ammonia-containing wastewater output pipe is provided with a downward spray structure inside the ammonia stripping tower so that the alkaline ammonia-containing wastewater can be sprayed downward to contact the steam.

[0023] In this embodiment, the steam input pipe extends into the lower part of the ammonia stripping tower, and an upward spray structure is provided inside the ammonia stripping tower so that steam is output upward to contact the alkaline ammonia-containing wastewater.

[0024] In this embodiment, the bottom of the ammonia stripping tower is provided with a low-concentration ammonia-containing wastewater inlet pipe 72, which is connected to the heat medium inlet of the preheater via the tower bottom discharge pump 8, so as to provide heat exchange energy for the alkaline ammonia-containing wastewater. A return branch pipe 73, which penetrates into the lower part of the ammonia stripping tower and is equipped with a spray structure, is provided on the low-concentration ammonia-containing wastewater inlet pipe so that some of the low-concentration ammonia-containing wastewater can flow back into the ammonia stripping tower.

[0025] In this embodiment, the outlet of the preheater is connected to a low-concentration ammonia-containing wastewater outlet pipe 62 connected to the wastewater system for subsequent wastewater treatment.

[0026] In this embodiment, a low-temperature chilled water inlet pipe 91 is connected to the lower side wall of the cooler, and a low-temperature chilled water outlet pipe 92 is connected to the upper side wall of the cooler, so as to provide a cold source for the cooler.

[0027] Working principle: 1. Mixed feeding: Ammonia-containing wastewater of different concentrations is pumped to ammonia stripping tower 7 via ammonia-containing wastewater discharge pump 4. During this process, NaOH in NaOH storage tank 1 is fully mixed with ammonia-containing wastewater via metering pump 2 and pipeline mixer 5. The mixed alkaline ammonia-containing wastewater and the low-concentration ammonia-containing wastewater discharged from tower bottom discharge pump 8 exchange heat at preheater 6 to increase the feed temperature. 2. Distillation: The mixture after passing through preheater 6 enters ammonia stripping tower 7, where it comes into contact with the steam at the bottom. Under the action of the packing material (such as Pall rings, stepped rings, or corrugated structured packing) inside the ammonia stripping tower, the light components (gaseous ammonia) in the ammonia-containing wastewater evaporate and become gaseous, entering cooler 9. The heavy components (water, NaOH) in the ammonia-containing wastewater enter the bottom of the ammonia stripping tower by gravity. Then, through the bottom discharge pump 8, part of it is refluxed (returned to the bottom of the ammonia stripping tower through the reflux branch pipe) and part of it is discharged (entering the preheater through the low-concentration ammonia-containing wastewater inlet pipe). After heat exchange in preheater 6, it is pumped to the wastewater system for low-concentration ammonia wastewater treatment. 3. Preparation of ammonium sulfate: After industrial water is injected into the ammonium sulfate storage tank 10, it is cooled and circulated in the cooler 9 by the action of the ammonium sulfate discharge pump 14. Then, concentrated sulfuric acid is added and adjusted to an appropriate concentration to fully absorb the light components (gaseous ammonia) after passing through the ammonia stripping tower 7. By continuously absorbing ammonia, the concentration of ammonium sulfate in the ammonium sulfate storage tank 10 is increased. After reaching the target concentration, it is pumped to the packaging system for packaging by the ammonium sulfate discharge pump 14.

[0028] If this utility model discloses or relates to mutually fixedly connected parts or structural components, then unless otherwise stated, a fixed connection can be understood as: a detachable fixed connection (e.g., using bolts or screws) or a non-detachable fixed connection (e.g., riveting or welding). Of course, mutually fixed connections can also be replaced by an integral structure (e.g., manufactured using a casting process) (except where it is obviously impossible to use an integral forming process).

[0029] In addition, unless otherwise stated, the terms used to indicate positional relationships or shapes in any of the technical solutions disclosed in this utility model above include states or shapes that are similar to, close to, or approximate with them.

[0030] Any component provided by this utility model can be assembled from multiple individual components, or it can be a single component manufactured by a one-piece molding process.

[0031] The above description is only a preferred embodiment of the present utility model. All equivalent changes and modifications made within the scope of the patent application of the present utility model shall be covered by the present utility model.

Claims

1. A device for preparing ammonium sulfate from high-concentration ammonia-containing wastewater, comprising an ammonia-containing wastewater storage tank and a NaOH storage tank, characterized in that, The output pipelines of the ammonia-containing wastewater storage tank and the NaOH storage tank are connected to the upper part of the ammonia stripping tower via a pipeline mixer and a preheater. A steam input pipe is provided at the lower part of the ammonia stripping tower. The light component output pipe at the top of the ammonia stripping tower is connected to the ammonium sulfate storage tank via a cooler. An industrial water inlet pipe and a concentrated sulfuric acid inlet pipe are provided at the top of the ammonium sulfate storage tank. A circulation pipe is provided at the bottom of the ammonium sulfate storage tank and connected to the light component output pipe via an ammonium sulfate discharge pump. A discharge branch pipe connected to the ammonium sulfate packaging system is provided on the circulation pipe.

2. The device for recovering high-concentration ammonia-containing wastewater to produce ammonium sulfate according to claim 1, characterized in that, The output pipeline of the ammonia-containing wastewater storage tank is connected to one end of the pipeline mixer, and an ammonia-containing wastewater discharge pump is installed on the output pipeline of the ammonia-containing wastewater storage tank.

3. The apparatus for producing ammonium sulfate from high-concentration ammonia-containing wastewater according to claim 1 or 2, characterized by, The output pipeline of the NaOH storage tank is connected to one end of the side wall of the pipeline mixer, and a metering pump is installed on the output pipeline of the NaOH storage tank.

4. The device for preparing ammonium sulfate from high-concentration ammonia-containing wastewater according to claim 1, characterized in that, The other end of the pipeline mixer is connected to the cold medium inlet of the preheater. The cold medium outlet of the preheater is provided with an alkaline ammonia-containing wastewater output pipe that penetrates into the upper part of the ammonia stripping tower. The alkaline ammonia-containing wastewater output pipe is provided with a downward spray structure inside the ammonia stripping tower.

5. The apparatus for preparing ammonium sulfate from high-concentration ammonia-containing wastewater according to claim 1 or 4, characterized in that, The steam input pipe extends into the lower part of the ammonia stripping tower, and an upward-facing spray structure is installed inside the ammonia stripping tower.

6. The apparatus for preparing ammonium sulfate from high-concentration ammonia-containing wastewater according to claim 1, 2 or 4, characterized in that, The bottom of the ammonia stripping tower is equipped with a low-concentration ammonia-containing wastewater inlet pipe that is connected to the heat medium inlet of the preheater via the tower bottom discharge pump. The low-concentration ammonia-containing wastewater inlet pipe is equipped with a reflux branch pipe that penetrates into the lower part of the ammonia stripping tower and is equipped with a spray structure.

7. The apparatus for preparing ammonium sulfate from high-concentration ammonia-containing wastewater according to claim 6, characterized in that, The outlet of the preheater is connected to a low-concentration ammonia-containing wastewater outlet pipe that is connected to the wastewater system.

8. The apparatus for preparing ammonium sulfate from high-concentration ammonia-containing wastewater according to claim 1, characterized in that, The lower side wall of the cooler is connected to a low-temperature chilled water inlet pipe, and the upper side wall of the cooler is connected to a low-temperature chilled water outlet pipe.

Images